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Inclusive Production of Two Rapidity-Separated Heavy Quarks As a Probe of BFKL Dynamics

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Inclusive Production of Two Rapidity-Separated Heavy Quarks As a Probe of BFKL Dynamics Inclusive production of two rapidity-separated heavy quarks as a probe of BFKL dynamics Andrèe Dafne Bolognino Università della Calabria & INFN - Gruppo collegato di Cosenza, I-87036 Arcavacata di Rende, Cosenza, Italy E-mail: [email protected] Francesco Giovanni Celiberto Università di Pavia & INFN - Sezione di Pavia, I-27100 Pavia, Italy E-mail: [email protected] Michael Fucilla Università della Calabria, I-87036 Arcavacata di Rende, Cosenza, Italy E-mail: [email protected] Dmitry Yu. Ivanov Sobolev Institute of Mathematics, 630090 Novosibirsk, Russia Novosibirsk State University, 630090 Novosibirsk, Russia E-mail: [email protected] Beatrice Murdaca Università della Calabria & INFN - Gruppo collegato di Cosenza, I-87036 Arcavacata di Rende, Cosenza, Italy E-mail: [email protected] Alessandro Papa∗ Università della Calabria & INFN - Gruppo collegato di Cosenza, I-87036 Arcavacata di Rende, Cosenza, Italy E-mail: [email protected] The inclusive photoproduction of two heavy quarks, separated by a large rapidity interval, is proposed as a new channel for the manifestation of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics. The extension to the hadroproduction case is also discussed. arXiv:1906.05940v1 [hep-ph] 13 Jun 2019 XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects - DIS2019 8-12 April, 2019 Torino, Italy ∗Speaker. c Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). https://pos.sissa.it/ Inclusive production of two rapidity-separated heavy quarks Alessandro Papa 1. Introduction Semihard processes (s Q2 L2 , with s the squared center-of-mass energy, Q the process QCD hard scale and LQCD the QCD mass scale) represent a challenge for high-energy QCD. Fixed-order perturbative calculations miss the effect of large energy logarithms, which must be resummed to all orders. The theoretical tool for this resummation is the BFKL approach [1], valid both in the n leading logarithmic approximation (LLA) (all terms (as ln(s)) ) and in the next-to-LLA (NLA) (all n terms as(as ln(s)) ). In this approach, the (possibly differential) cross section factorizes into two process-dependent impact factors and a process-independent Green’s function. Only a few impact factors have been calculated with next-to-leading order accuracy: parton to parton [2], parton to forward jet [3], parton to forward hadron [4], g∗ to light vector meson [5] and g∗ to g∗ [6]. They were used to build predictions for a few exclusive processes: g∗g∗ to two light vector mesons [7] and the g∗g∗ to all [8], which can be studied in future high-energy linear colliders. They enter, however, a lot of inclusive processes, accessible at LHC: Mueller-Navelet jet production [9], three and four jets, separated in rapidity [10], two identified rapidity-separated hadrons [11], forward identified light hadron and backward jet [12], forward J=Y-meson and backward jet [13], forward Drell-Yan pair and backward jet [14]. Here we present another possible BFKL probe: the inclusive production of two heavy quarks, separated in rapidity, in gg collisions (photoproduction), g(p1) + g(p2) Q(q1) + X + Q(q2) ; (1.1) −! where Q here stands for a c- or b-quark (see Fig. 1(left)). This process can be studied either at + e e− or in nucleus-nucleus colliders via the interaction of two quasi-real photons. Here we focus + on e e− collisions, but we briefly discuss also the case of production in proton-proton collisions (hadroproduction), via a gluon-initiated subprocess. 2. Theoretical setup: photoproduction case The impact factor relevant for the process given in (1.1) reads [15], at leading order 1 2 aase dF = Q N2 1 m2R2 +~P2 z2 + z2 d2q dz; p c − q h i 1 1 ~q ~k ~q R = ; ~P = + − : m2 +~q 2 − m2 + (~q ~k)2 m2 +~q 2 m2 + (~q ~k)2 − − Here a and as denote the QED and QCD couplings, Nc the number of colors, eQ the electric charge of the heavy quark, m its mass, z and z 1 z the longitudinal fractions of the quark and antiquark ≡ − produced in the same vertex and ~k, ~q, ~k ~q the transverse momenta with respect to the photons − collision axis of Reggeized gluon, produced quark and antiquark, respectively. Similarly to the dihadron production processes (see [11]), we have ¥ dsgg 1 = 2 C0 + 2 ∑ cos(nj)Cn ; dy1dy2d ~q1 d ~q2 dj1dj2 (2p) j j j j " n=1 # 1In Ref. [16] the factor N2 1 was forgotten; plots and tables in the present paper take it properly into account c − and, thus, overwrite the corresponding ones in Ref. [16]. p 1 Inclusive production of two rapidity-separated heavy quarks Alessandro Papa q1 p1 p1 p1 Φ ~k1, ~q1,z1 k1 k1 X G(~k1,~k2) k k 2 2 Φ ~k2, ~q2,z2 p2 p2 − p2 q2 Figure 1: (Left) Heavy-quark pair photoproduction. (Right) BFKL factorization: crosses denote the tagged quarks, whose momenta are not integrated over for getting the cross section. 2 2 2 Table 1: C0 [pb] vs. DY for qmin = 0 GeV and ps = 200 GeV; C stands for mR=(s1s2), with s1;2 = m1;2 +~q1;2. LLA LLA LLA NLA NLA NLA DY Box qq¯ C = 1=2 C = 1 C = 2 C = 1=2 C = 1 C = 2 1.5 98.26 415.0(1.3) 65.24(31) 28.94(14) 16.96(10) 11.237(73) 10.289(74) 2.5 42.73 723.7(2.1) 88.64(36) 34.58(17) 17.580(91) 9.581(57) 8.504(56) 3.5 14.077 1203.4(3.4) 113.33(43) 39.01(16) 18.522(92) 7.989(43) 6.637(36) 4.5 3.9497 1851.6(5.0) 133.64(52) 40.42(19) 18.412(90) 6.210(31) 4.893(25) 5.5 0.9862 2559.4(7.1) 140.23(55) 37.18(17) 16.971(83) 4.329(21) 3.138(15) 1 where j = j1 j2 p, with j1 2, ~q1 2 and y1 2, respectively, the azimuthal angles, the transverse − − ; ; ; momenta and the rapidities of the produced quarks. The Cn coefficients encode the two leading- order impact factors and the NLA BFKL Green’s function (see Fig. 1(right)). For brevity, the expression for Cn is not presented here; it can be found in Ref. [16], to which we refer for all details concerning the present paper. + For the process initiated by e e− collisions, we must take into account the flux of quasi-real photons dn=dx emitted by each of the two colliding particles. The cross section, differential in the rapidity gap DY between the two tagged heavy quarks, reads then q q y(1) y(2) ds + max max max max e e− = dq dq dy dy d (y y DY) 1 2 (1) 1 (2) 2 1 2 d (DY) qmin qmin ymax ymax − − Z Z Z− Z− 1 1 dn1 dn2 (1) (2) ymax y dx1 ymax+y dx2 dsgg ; (2.1) × e− − 1 dx e− 2 dx Z 1 Z 2 (1) s (2) s with ymax = ln 2 2 and ymax = ln 2 2 , where s is the squared center-of-mass energy of the m1+~q1 m2+~q2 + colliding e e−qpair. In the followingq we will present results for the integrated azimuthal coeffi- cients Cn, defined through ¥ d + 1 se e− = 2 C0 + 2 ∑ cos(nj)Cn : d (DY)dj1dj2 (2p) " n=1 # 2 Inclusive production of two rapidity-separated heavy quarks Alessandro Papa 2 2 2 Table 2: C0 [pb] vs. DY for qmin = 0 GeV and ps = 3 TeV; C stands for mR=(s1s2), with s1;2 = m1;2 +~q1;2. LLA LLA LLA NLA NLA NLA DY Box qq¯ C = 1=2 C = 1 C = 2 C = 1=2 C = 1 C = 2 1.5 280.98 10.893(49) 103 530.8(2.4) 195.54(88) 99.57(89) 58.34(58) 52.17(58) · 3.5 48.93 54.84(14) 103 1568.9(7.6) 439.4(2.1) 184.5(1.1) 65.22(50) 54.38(47) · 5.5 4.9819 254.88(57) 103 4409(19) 930.6(4.2) 380.2(1.8) 75.83(53) 55.22(36) · 7.5 0.4318 1041.7(2.1) 103 10.921(44) 103 1743.1(8.3) 756.3(3.5) 81.94(44) 51.48(27) · · 9.5 0.0323 3429.0(7.8) 103 21.530(80) 103 2618(12) 1267.0(6.1) 72.73(36) 38.86(19) · · 10.5 0.0081 5468(14) 103 26.23(10) 103 2761(12) 1443.3(7.2) 59.97(30) 29.21(14) · · 3. Numerical analysis 2 We consider only the case of c-quark with mass m = 1:2 GeV/c and fix qmax = 10 GeV and qmin = 0, 1, 3 GeV. We take ps = 200 GeV, as in LEP2, with 1 < DY < 6, and ps = 3 TeV, as in + the future e e− CLIC linear accelerator, with 1 < DY < 11. In Tables 1-2 we show pure LLA and NLA BFKL predictions for C0 with qmin = 0 GeV and ps = 200 GeV and 3 TeV, respectively, and compare them with the exclusive photoproduction of a cc¯ pair, given by two “box” diagrams. We see that at LEP2 energies the “box” cross section dominates, but at CLIC energies BFKL takes over. Results for C0, R10, and R20 C2=C0 with qmin = 1, 3 GeV and ps = 200 GeV and 3 TeV are ≡ shown in Fig.
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